/*
 * Copyright (C) 2014 hu
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
package test.souplang;

import java.util.ArrayList;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Element;

/**
 * 
 * @author hu
 */
public abstract class LangNode {

	public static final Logger LOG = LoggerFactory.getLogger(LangNode.class);

	public String name = null;

	public void readName(Element xmlElement) {
		name = xmlElement.getAttribute("name");
		if (name.isEmpty()) {
			name = null;
		}
	}

	public abstract Object process(Object input, Context context) throws Exception;

	public abstract boolean validate(Object input) throws Exception;

	public void save(Object output, Context context) {
		if (context != null && name != null) {
			context.output.put(name, output);
		}
	}

	public void processAll(Object input, Context context) throws Exception {

		if (!validate(input)) {
			return;
		}
		Object output = null;
		try {
			output = process(input, context);
		} catch (Exception ex) {
			LOG.info("Exception", ex);
			return;
		}
		save(output, context);
		/*
		 * if (output == null) { return; } for (LanguageNode child : children) {
		 * child.context=this.context; child.processAll(output); }
		 */
	}

	public ArrayList<LangNode> children = new ArrayList<LangNode>();

	public void addChild(LangNode child) {
		this.children.add(child);
	}

	public void printTree(String prefix) {
		System.out.println(prefix + this.getClass());
		for (LangNode child : children) {
			child.printTree("   " + prefix);
		}
	}
}
